Valve-locking device.



l PATENTED JULY 30, 1907.

W. L. CASH.

VALVE LOCKING DEVICE.

APBLIGATION FILED FEB. 5. 1906.

nu: NnRRls PEM-Rs co., WASHINGTON, Dc.

UNITED STATES PATENT OFFICE.

WILLIS L. CASE, OF NEW BRITAIN, CONNECTICUT.

VALVE-LOCKING DEVICE.

Specification of Letters Patent.

Patented July 30, 1907.

To all 'whom 'it may concern:

Be it known that I, WILLIS L. CAsn, a citizen of the United States of America, residing at New Britain, in the county oi Hartford and State of Connecticut, have invented certain new and useful Improvements in Valve-Locking Devices, of which the following is a specification.

My device relates to improvements in valves and particularly topdevices for locking the valve in open and closed positions.

Figure l is a side elevation view. Fig. 2 is a top view showing cross section of Fig. l at 2 2.

The valve proper consists of the usual valve body a, a valve plug b secured in place by the screw c, and the handle d. The valve plug has the lateral chamber e; a passage e extends vertically from the top of the plug down into the chamber e. A detent f having a cam surface f/ which is shown as being formed by a circumferential groove having inclined sides, is located in the chamber e. A spring y located in the chamber e back of the detent normally forces it radially outward. In the inner walls of said valve body are recesses h into which the detent is forced at open and closed positions ofthe valve by the spring g. When the valve is locked the cam surface f/ lies underneath the vertical passage ef. In this vertical passage therel is located a plunger j whose lower end is tapered as at j/ to engage the cam surface f so that when it is pressed down the tapered end of the plunger rides down the cam surface retraeting the detent and compressing the'spring g so that the valve. plug may be free t0 turn. When the plunger is released the spring g forces the detent outward and into the recess when the valve is in open or closed position.

In order to prevent accidental withdrawal of the plungerv it is reduced in diameter as at jg, the end of a set-screw 7c riding in said reduced portion.

I claim as my invention:

1. A valve locking device comprising the vbody having a plug' orifice, a plug; in said orifice, a radially movable detent carried by said plug and adapted to engage recesses in the body to lock the plug in the open and closed position of the valve, a spring normally forcingsaid detent into engagement with said body, and a vertically movable plunger coperatingwith said detent to discngage it from said body.

2. A valve lockingT device comprising the body having a plug orifice, a plug in said orice, a radially movable detent carried by said plug and adapted to engage recesses in the body to lock the plugl in open and closed positions, a spring acting on said detent to normally force it into enl gagement with the body, a cam face on said detent, and a vertically movable plunger coperating,` with said cam face to retract the detent, substantially as described.

3. A valve locking device comprising the body having a plug orifice and recesses in the walls thereof, a plug, a radially movable detent carried thereby and adapted to enter said recesses to lock the valve, a spring acting on said detent to normally force it into engagement with said recesses, and a vertically movable plunger for retracting said detent. I

4. A valve locking device comprisingr the body having a plm.r orifice, recesses arranged radially in the walls thereof, a plug, a radially movableI detent carried by said plug and normally forced by a springto enter said recesses to lock the Valve, said spring, a circumferential groove about said detent forming a cam face, and a vertically movable plunger having a tapered end coperating with said cam face on the detent to retract said detent against the force 0f said spring to unlock said plug, substantially as described.

In testimony whereof I allix my signature in presence of two Witnesses.

WILLI S L. CASE.

Witnesses A. S. PARSONS, A. J. Snornn. 

